Process for the building up of spongy lead plates for electric storage batteries.



To all whom it may concern:

ritiri-ED STATES; PATENT OFFICE.

JULIUS DIAMANT, OF GYR, AUSTRlA-HUNGARY.

PROCESS FOR THE 'BUILDING UP OF SPONGY LEAD PLATES FOR ELECTRIC STORAG BATTERIES.

Specification of Letters Patent.

Patented July 9,' 1907.

Application filed November 28, 1906. Serial No.. 345,482.

lie it known that I, J ULiUs DIAMANT, a subject of the hing of Hungary, residing at Gyor, in the Empire of i'rustria-l'lungary, have invented new and useful Iniprovcinents in Processes for the Building up of Spongy Lead Plates for Electric Storage Batteries, of which the following is a specification.

This invention relates to a process for the building up of spongylead plates for electric storage batteries. The capacity of storage batteries which are constructed of the type of the so-called .massplates, depends upon the porosity oi' the active material. Moreover negative spongy lead plates show a 1re-action whereby their porosity, after a shorter or longer period of use, is reduced especially at the surface of the plate and thereby their capacity is reduced, even While the interior of the mass still retains the original capacity, because the saune can no longer be effective in consequence of the shutting out of the electrolyte by reason of the superficial dense layer. Experiments have shown that such plates rendered dense on their surface can again attain their original capacity, if `the dense surface he ,trans, i'erred into thc interior of the mass, and in place thereoi' for the outsides of the plates a sectional surface ob tained from the interior of the plate can be exposed.

The process is carried out in its simplest form when the spongy lead plate possesses originally one or more sectional planes parallel to its surface, because in this case the interchange of the dense surface layer with a surface taken from the interior of the plate, by simply turning it round or exchanging the separate plates can be effected. These plates thus recover not only the original capacity but there also occurs in the mass, as the new surface gradually becomes denser, a regeneration of the iirst condensed surface which is now placed p in thc interior of the plate, so that this latter, when it becomes again necessary to expose a new plate surface7 can be again turned to the outside. It is also-advan tagcous` not to wait for thc interchange ol' the surfaces until the condensation thereof is rendered perceptible by a remarkable decrease in the capacity, but one can already cause a regeneration of the surface by placing the saine in the interior of the plate so that the results of the condensation of the surface, such as the contraction of the active material and the appearance of symptoms of sulfating, Inay be prevented.

In the manner above described the life of the spongy lead plates may he renderedl completely independent of the 'appearance of condensing or of the drawbacks associated therewith.

I n order to render the process clear reference will be l made to the accompanying drawing.

Figure 1 represents a section-ot an ordinary spongy plate which is to be regenerated; Figs` 2, 3,4 and 5rcpresent transverse vertical sections of the plate .showing various arrangements of the sections thereof.

The form shown in Fig. l is first cut from a central 'plane indicated by the line a--x into two parts or sections or the plate may beinitially made up from two .sections indicated in Fig. 2. W hen the plate formed in either way is to be regenerated it isdividcd and the relative order of Vthe sections is changed to bring the internal surface to the outside and vice versa. Thescctions l and 2 as shown in Fig. 2 are divided and rearranged in the order 2, l, as shown in Fig. 3 being again altered wlien required and so on.

The plates are divided into any number of sections, for instance, l, 2, 3 shown in Fig, 4 which may be rcairanged to 2, 3, I. as shown-in Fig. 5 to bring fresh surface to the outside at each rearrangement.

What l claim is:

i. A process for prolonging activity of spongy lead plaies for electric storage batteries which consists in dividing the plates into sections and then varying the relative order ot ilu: sections to brim.;l the internal surfaces to the outside :ind the deteriorated surface to the inside.

1.. A process for prolonging 'thc activity of spuug-y lead plates for electric storage batteries which consists in dividing the plates into .ions and vnryingltlic relative order of the sections before the exposed surface shows-signs of .sulfatingl so :is to bring ille internal surface to the outside and the rletcriornted surface to the inside,

in testimony \\'liereoi' i lmvc signed my naine to this spccicatinn in tlie presence oi two subscribing witnesses.

.T ULlUS IIIA MAN'L'. 

